16. YTO Loop Adjustments
If the power level of the displayed fundamental below 20 MHz is too
low, decrease
the
value
of
factory-select component
If
the power level of the displayed fundamental between 20 MHz and
30 MHz is too low, decrease the
of factory-select component
If the power level of the displayed fundamental above
30 MHz is too high, increase the value of factory-select component
Refer to
3-3 for the acceptable range of values
for
and to
3-4 for HP part
numbers. See Figure 3-73 for the location of
and Al
52. Set the Spectrum Analyzer (DUT) LINE switch to STANDBY.
Disconnect the second spectrum analyzer from the RF Section
AllJ5 IF OUT. Disconnect the synthesized sweeper from the RF
Section
M/N IN.
53. Replace the cover on
YTO Loop Sampler Assembly. Loosen
the Servicing Support Screw holding the All YTO Loop Assembly
in the Service Position. Grasp the two metal extractors on the
All YTO Loop Assembly and slide the assembly back into the RF
Section, mating the two guide pins with the corresponding guide
sleeves on the A23 Motherboard Assembly. Replace the three
screws (marked with the letter A) securing the All YTO Loop
Assembly in the RF Section.
54. Reconnect cable 8 (gray) to Al
PHASE DET OUT, cable 93
(white/orange) to Al
M/N IN, and the cable 5 (green) to Al
IN. Reconnect the cable 0 (black) to AllJ4 IF IN and Al
IF OUT.
55. Remove the SMA 50 ohm termination from the YTO OUT
connector of
CIA Assembly. Install the termination on the
RF Section front-panel
LO OUTPUT connector.
56. Reconnect semi-rigid coax cable W 11 to the YTO OUT connector
of
CIA Assembly. Reconnect the opposite end of
to
AT2 (for RF Sections 2526A and below,
connects to cable
57. Remove the jumper from between
and ground. Remove
the jumper between
and
(LOCK INDICATOR
DISABLE).
58. Replace the RF Section’s bottom cover.
Adjustments 3-145
